Apparatus for introducing liquid into veins.



G. W. EASTMAN. APPARATUS FOR INTRODUCING LIQUID INTO VEINS.

- I APPLICATION Fl LED DEC. 22, 1913. 1,170,805.

Patented Feb. 8, 1916.

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l a pneafitaiileaineeember 22,1913

" EOBQ Q To all whom it may concern: I p

*Be' it-knowii' tliat I,"GnoRGn VV-A1imn Easr-f resi'dent of Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Apparatus for Introducing Liquid into Veins, of which the following is a specification.

This invention relates to apparatus for introducing a liquid into a vein of the circulatory system of a human body, the liquid being either a remedial hypodermicforced under pressure by a syringe or pump, or blood transfused directly from one body to another.

The object of the invention is to prevent the introduction of air with the liquid and the well known serious results attending the introduction of air.

The invention consists in the improvements which I will now proceed to describe and claim.

7 Of the accompanying drawings,Figure 1 represents a perspective view of an apparatus embodying my invention. Fig. 2

representsa longitudinal section of the transparent conduit portion hereinafter described.

' The same reference characters indicate the same parts in all the figures.

'In the draWings,--12 represents a hypo dermic needle of common construction, the base of the needle being usually provided with a thumb or finger rest 13. The, hub 14 of the needle is connected with a tubular conduit communicating with the lumen of the needle and adapted to conduct liquid thereto. A portion 15 of said conduit is made of glass or other transparent material, so that air bubbles passing through the conduit to the needle are visible in the portion 15. The glass portion 15 is provided between its ends with a lateral branch16 preferably of the same material, said branch when held vertically constituting an air chamber adapted to trap air passlng through the portion 15, the trapped air being therefore prevented from passing to the needle 12. The branch 16 is "preferably provided with a stop cook 17 adapted to' liberate the trapped air. I also prefer to provide the portion 15 with stop cocks 18 and 19 at opposite sides of the branch or air chamber 16, these stop cocks enabling the operator to more carefully guard against the possibility of air passing through the portion tothe needle.

.inamesto amamm mu ip'iiv" As there shown,

g the conduit includesflexibleportions 20am MAN, a citizen of the United-States, anda 21'', which may be lengths of rubber tubing,

the portion 20 connecting one end of the glass portion with a three-way cock-22, Wh1le the port1onf21 connects the opposite end of the glass portion with the hub of the needle 12. When liquid is to be injected into a. vein by a mechanical pressure, the three-way cock 22is connected by a tube 23 with a syrlnge barrel 24 and the casing of thethree-way .cock'is connected by a fiexi ble tube 25 with a receptacle 26 containing 17, closed. As the fluid passes the branch 16 any air or gases occluded within the fluid is trapped by said branch, passing up- I Should it be desired to wardly thereinto. permit the dischargeof thetrapped air or gas, the operation may be arrested long enough to close cook '19 and open cook 17, whereupon the pressure in conduit 15'Will expel any air or gas within the branch 16. J i

By again closing cock 17 and opening cock 7 19 the operation of the apparatus may continue.

The glass conduit portion 15 with its air chamber may be a part of an apparatus adapted to be'u'sed in'the direct transfusion of blood from one human body to another, in which case the syringe and the three-way cock will be omitted.

I 'claim:

1. An apparatus for introducing liquid into the veins, comprising a hypodermic needle, a conduit communicating wlth the lumen of said needle andprovided with a laterally extended branch 'forming'an air chamber to trap any air that may be 0ccluded Within the liquid, said branch being open at its outer end .and provided with" meansfor permitting escape of the trapped air when desired, and means on both sides of saidbranch to interrupt the flow ofsaid fluid when the trapped air is permitted to escape. p I I '2. An apparatus for introducing liquid into} the veins, comprising a hypodermic needle, a conduit communicating With the at the opposite ends of said transparent poro lumen of said needle and provided With a tion to interrupt the flow of fluid When the transparent portion having a lateral-1y eX- trapped air is permitted to escape. tended branch forming an air chamber to In testimony whereof I have afiixed my 5 trap any air that'inay'be occluded Within the signature, in presence of tWo Witnesses.

liquid, said branch being open at its outer GEORGE WARREN EASTMAN. 1" end, a cock for controlling the open end of Witnesses: said branch for permitting escape of the R D LPH W. CURRIER, trapped air when desired, and cocks located GEORGE I. Dom).

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

